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Radiant Cut Lab Grown Diamond Engagement Rings

Crafted by our jewellers with care and precision.

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Radiant Cut Engagement Rings - Bright, Bold and Made for You

Striking, elegant and timeless, the radiant cut is a powerful, contemporary choice for those seeking a classic shape with a modern edge. An elegant fusion of the round and emerald cuts, the sparkling brilliance of a radiant cut complements a wide range of settings, including solitaires, halos and vintage-inspired bands. In its rectangular form, the radiant cut displays an optical illusion of elongation, creating a flattering effect on the hand. Known for its elegant geometry and trimmed corners, the radiant cut is a symbol of innovation and creativity.

Take the first step in your forever journey by creating the radiant cut engagement ring of your dreams with our custom ring builder. From concept to completion, experience the ease and freedom of seeing your very own radiant cut design come to life as our knowledgeable client advisors walk alongside you every step of the way.

At Cullen, every radiant cut ring is handcrafted using premium materials and lab grown gemstones. Explore the collection online or begin your journey in one of our showrooms with a personalised design consultation — whatever the process, we're here to help you cherish your forever love with the ring of your dreams.

Because Forever Deserves Something Unforgettable

Cullen specialises in custom radiant cut engagement rings, handcrafted to mark one of life’s most meaningful moments in a style unique to your love.

A beautiful union of contemporary creativity and timeless design, the radiant cut is a stunning choice for the ring of your dreams. With incredible sparkle, a flattering lengthening effect on the hand and exquisitely trimmed corners, a radiant cut diamond engagement ring is the ideal choice for those who value modern innovation and enduring, classic beauty.

Whether you’re searching for a vintage-inspired halo or timeless solitaire, our experienced jewellers and knowledgeable client advisors will guide you through every step of the journey — from concept to completion. 

Need a little guidance? Don’t hesitate to contact us or book an appointment with one of our friendly engagement ring specialists to begin exploring our elongated radiant cut engagement rings in the UK.

Why Cullen

Worldwide Express Shipping No matter where you are in the world, your dream ring will go the distance. We proudly ship our radiant cut engagement rings UK-wide and internationally, ensuring your custom piece arrives safely and swiftly.

Free Resizing We offer free resizing on all engagement rings to ensure the perfect fit, whether you've chosen one of our ready-to-ship  radiant cut diamond engagement rings or something uniquely your own.

Lifetime Warranty Our beautiful radiant cut engagement rings are built to last a lifetime. Each piece is backed by our lifetime manufacturing warranty, giving you complete peace of mind.

Tailored Ring Customisation From modern radiant cut engagement rings to personalised band details, we offer an extensive customisation service so you can craft a ring that’s truly one of a kind

Thoughtfully Designed in Melbourne, Australia Every ring — including our custom radiant cut engagement rings, is crafted by our expert jewellers with exceptional attention to detail.

Conflict-Free, Consciously Crafted We offer a variety of unique options, from moissanite radiant cut engagement rings to coloured sapphire engagement rings, all thoughtfully curated for your forever ring.

Carbon Neutral Gemstones & Trees For The Future We offset the carbon footprint of all of our gemstones and plant a tree for each ring sold, supporting global reforestation.

Custom Design Specialists Whether you're dreaming of solitaire radiant cut diamond engagement rings or an elaborate halo of diamonds, our team specialises in creating jewellery that reflects your personal style.

Looking for a specific style? Choose from our collections below:

A radiant cut diamond is a rectangular-shaped diamond with lengthened sides and trimmed corners, known for its exquisite brilliance and lengthened appearance. A radiant cut diamond is an elegant blend of classic and contemporary design and is a flattering choice for a variety of settings.

A radiant cut engagement ring is the perfect combination of the traditional round cut and striking emerald cut. With a dazzling geometrical brilliance, the radiant cut adds a timeless yet contemporary edge to any engagement ring while also providing a flattering, lengthening effect on the hand.

Absolutely. Cullen specialises in custom engagement and wedding rings. Choose from a range of centre stones, side stones, and precious metals, as well as various settings. Whether you are interested in an engagement ring with a radiant centre stone or wedding bands to pair with radiant engagement rings, our experienced design specialists will guide you through the custom design process to create the perfect ring that reflects your unique style.​

We offer a selection of consciously curated gemstones in radiant cut, including:​

Each gemstone is chosen for its quality and sustainability, ensuring your ring is both beautiful and responsibly made.​ Browse our collection of radiant cut engagement rings or create your own using our custom ring builder.

To maintain the brilliance of your sparkling radiant engagement ring:

  • Clean it regularly with mild soapy water and a soft brush.
  • Avoid exposing it to harsh chemicals or abrasive materials.
  • Store it separately to prevent scratches.
  • Schedule periodic professional cleanings and inspections.​


Proper care will keep your ring looking its best for years to come.​ For more information, check out our ring care and ring cleaning guides.

The price of rings with radiant cut centre stones at Cullen varies based on factors such as the chosen gemstone, carat weight, and setting design. We offer a range of designs to suit different budgets, and our team can help you find or create a ring that meets your preferences and price point.​

Lab grown radiant cut diamonds possess the same chemical composition, crystal structure, and physical properties as mined diamonds, making them virtually indistinguishable. They are also often more affordable, making them an excellent choice for engagement rings and other jewellery.

The price of rings with radiant cut centre stones at Cullen varies based on factors such as the chosen gemstone, carat weight, and setting design. We offer a range of designs to suit different budgets, and our team can help you find or create a ring that meets your preferences and price point.​ 

All gold and platinum jewellery from Cullen comes with a lifetime manufacturing warranty. This warranty covers any defects in materials or workmanship, giving you peace of mind that your ring is crafted to the highest standards.​